to sleep or not to sleep… may 6 2010d. nesdoly md frcpc to sleep or not to sleep… consequences...

To Sleep or Not to Sleep…


May 6 2010May 6 2010 D. Nesdoly MD FRCPCD. Nesdoly MD FRCPC



Consequences of Sleep Loss

Consequences of Sleep Loss

Scenarios

Scenarios

Scenarios

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Objectives

Objectives

Sleep Science historySleep Mechanics 101Sleep Deprivation ConsequencesShift-work risks ‘evidence’

Strategies Future research

Sleep Science historySleep Mechanics 101Sleep Deprivation ConsequencesShift-work risks ‘evidence’

Strategies Future research

Sleep Science History

Sleep Science History

1930 Berger- “Father of EEG”1937 Loomis- first overnight EEG human sleep recordings

1968 Standardized manual1974-Williams normative sleep data

2010-Accreditated Sleep Centers

1930 Berger- “Father of EEG”1937 Loomis- first overnight EEG human sleep recordings

1968 Standardized manual1974-Williams normative sleep data

2010-Accreditated Sleep Centers

Sleep BasicsSleep

Basics 3 Mechanisms ANS

PNS SNS

Homeostatic Sleep Drive

Circadian Sleep Rhythm

3 Mechanisms ANS

PNS SNS

Homeostatic Sleep Drive

Circadian Sleep Rhythm

Sleep StagesSleep Stages

Sleep WavesSleep Waves

Sleep Architecture

Sleep Architecture

ircaCircadian Sleep

DisordersCircadian Sleep

Disorders

Sleep Quantification

Sleep Quantification

ObjectiveMSLTMWTPVT

SubjectiveSleepiness scales

Stanford (1973 7 point)

Karolinska (1990 9 point)

Epworth (1991 situation-specific dozing likelihoods)

ObjectiveMSLTMWTPVT

SubjectiveSleepiness scales

Stanford (1973 7 point)

Karolinska (1990 9 point)

Epworth (1991 situation-specific dozing likelihoods)

Effects of Sleep Deprivation

Effects of Sleep Deprivation

Recovery Studies

Recovery Studies

Shift-work Syndrome

Shift-work Syndrome

Prevalence(U.S.-22 M SW +3% )Canada 11% rotating, 6% evening, 2% nights

Prototype Insomnia / Sleepiness Fatigue / Headache / Anxiety Indigestion / Pyrosis Hypertension Weight gain Menstrual irregularity / Sub-fertility / SA Depression Drowsy driving

Prevalence(U.S.-22 M SW +3% )Canada 11% rotating, 6% evening, 2% nights

Prototype Insomnia / Sleepiness Fatigue / Headache / Anxiety Indigestion / Pyrosis Hypertension Weight gain Menstrual irregularity / Sub-fertility / SA Depression Drowsy driving

Sleep Deprivation Impact

Sleep Deprivation Impact

IndividualFamilyCommunitySociety

IndividualFamilyCommunitySociety

Shift-work Impact

Shift-work Impact

Shift work + Cardiovascular Disease

Shift work + Cardiovascular Disease

Modest (+) associations w shift work (40%)

Causal link research inconsistent Daylight Saving Time *

Janszky (2008) Acute MI risk Mondays“Spring” Incidence ratio 1.051“Autumn” Incidence ratio 0.985

Modest (+) associations w shift work (40%)

Causal link research inconsistent Daylight Saving Time *

Janszky (2008) Acute MI risk Mondays“Spring” Incidence ratio 1.051“Autumn” Incidence ratio 0.985

Shift work (LAN) + Cancer


Schernhammer (2001) Nurses Health Study Cohort240,000 women over 30 yearsControl for major risk factors, stress, SE statusCancer relative risk

Breast 36-79 %Colon 35%Endometrial 43%

2007 IARC classifies ‘night shift work’ as probable carcinogen (2A)

Schernhammer (2001) Nurses Health Study Cohort240,000 women over 30 yearsControl for major risk factors, stress, SE statusCancer relative risk

Breast 36-79 %Colon 35%Endometrial 43%

2007 IARC classifies ‘night shift work’ as probable carcinogen (2A)



Observational studies: modest (+) relationship b/w LAN + breast Ca

Pukkala (1995) Flight attendants > 15 YTynes (1996) Radio + telegraph operators

Prostate Ca Airline pilotsFirefightersHealth practitioners + physicians

Observational studies: modest (+) relationship b/w LAN + breast Ca

Pukkala (1995) Flight attendants > 15 YTynes (1996) Radio + telegraph operators

Prostate Ca Airline pilotsFirefightersHealth practitioners + physicians

Circadian Disruption Shift

work + Risk of Ca

Circadian Disruption Shift

work + Risk of CaSeattle Research group

LAN + Breast Ca Case control study60-Hz magnetic fields + nocturnal melatonin

Night shift work + biomarkersMelatonin + hormonesGenotypes (hCLOCK, Per2, Per3)

Seattle Research groupLAN + Breast Ca Case control study60-Hz magnetic fields + nocturnal melatonin

Night shift work + biomarkersMelatonin + hormonesGenotypes (hCLOCK, Per2, Per3)

Shift work + Pregnancy

Shift work + Pregnancy

Moderate (-) effect on fetal growthSGA / LBW

No association for pre-term delivery or pre-eclampsia

Moderate (-) effect on fetal growthSGA / LBW

No association for pre-term delivery or pre-eclampsia

Study Limitations

Study Limitations

Epidemiologic vs RCTSelection bias

“Survivor population” (entrance + drop-out)

Lower socioeconomic statusShift work definitionExposure measurement

Epidemiologic vs RCTSelection bias

“Survivor population” (entrance + drop-out)

Lower socioeconomic statusShift work definitionExposure measurement

Shift Work Proposed Mechanisms

Shift Work Proposed Mechanisms

Shift-work + Risk

Shift-work + Risk

Needle-stick eventsAyas (2006) Trinkoff (2007)

Clinical performanceHoward (2003)-AnesthesiaLockley (2004)-ICUSmith-Coggins (2006)-Emergency

Needle-stick eventsAyas (2006) Trinkoff (2007)

Clinical performanceHoward (2003)-AnesthesiaLockley (2004)-ICUSmith-Coggins (2006)-Emergency

Transportation Safety

Transportation Safety

Prototype ‘drowsy driver’Young male < 25Shift-workerUntreated sleep disorder (OSA / Narcolepsy)

Event 2400-0700Social Media: “Contagious”

Prototype ‘drowsy driver’Young male < 25Shift-workerUntreated sleep disorder (OSA / Narcolepsy)

Event 2400-0700Social Media: “Contagious”

Transport + Sleep Deprivation

Transport + Sleep Deprivation

CommercialTruckRailAir / ATC

Performance impairment = Ethanol intoxicationDawson 1997Powell 2001Vakulin 2007

CommercialTruckRailAir / ATC

Performance impairment = Ethanol intoxicationDawson 1997Powell 2001Vakulin 2007

Drowsy Driving Strategies

Drowsy Driving Strategies

AwarenessLegislationHighway rumble stripsOperator behavior

NapsCaffeineEnvironmental stimuli

AwarenessLegislationHighway rumble stripsOperator behavior

NapsCaffeineEnvironmental stimuli

Sleep Loss Countermeasures


PharmacologicNon-pharmacologic




PharmacologicAntihistaminesBenzodiazepinesNon-benzodiazepinesAntidepressants

Serotonin modulator SSRIS SNRI Tetracyclic Tricyclic

Melatonin receptor agonistAlternative

Valerian Kava Chamomile Synthetic melatonin

Non-pharmacologic

PharmacologicAntihistaminesBenzodiazepinesNon-benzodiazepinesAntidepressants

Serotonin modulator SSRIS SNRI Tetracyclic Tricyclic

Melatonin receptor agonistAlternative

Valerian Kava Chamomile Synthetic melatonin

Non-pharmacologic




BehaviouralSleep deprivationReconditioningRelaxation techniquesCBT

Schedule strategiesRestrict maximum 3 consecutive shifts

Forward shift rotationParticipatory approach


BehaviouralSleep deprivationReconditioningRelaxation techniquesCBT

Schedule strategiesRestrict maximum 3 consecutive shifts

Forward shift rotationParticipatory approach

Wolkove, N. et al. CMAJ 2007;176:1449-1454

Sleep Hygiene

Future ResearchFuture

Research

Common definitions (SW)Common assessment (exposures)

Study intermediate pathways vs disease outcomes

Outcome data NOT biomarkers

Common definitions (SW)Common assessment (exposures)

Study intermediate pathways vs disease outcomes

Outcome data NOT biomarkers

SummarySummary

Sleep science ‘101’Sleep debt awarenessSleep hygiene / ‘art’ of sleeping

Drowsy driving KILLS people

Sleep science ‘101’Sleep debt awarenessSleep hygiene / ‘art’ of sleeping

Drowsy driving KILLS people

Reference List

Reference List

Any Questions?

Erica

A baby friendly way to establish

to sleep or not to sleep… may 6 2010d. nesdoly md frcpc to sleep or not to sleep… consequences...

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